System.Linq.Expressions.Expression.Call C# (CSharp) Method

        public static MethodCallExpression Call(MethodInfo method, Expression arg0, Expression arg1, Expression arg2, Expression arg3, Expression arg4)
        {
            ContractUtils.RequiresNotNull(method, nameof(method));
            ContractUtils.RequiresNotNull(arg0, nameof(arg0));
            ContractUtils.RequiresNotNull(arg1, nameof(arg1));
            ContractUtils.RequiresNotNull(arg2, nameof(arg2));
            ContractUtils.RequiresNotNull(arg3, nameof(arg3));
            ContractUtils.RequiresNotNull(arg4, nameof(arg4));

            ParameterInfo[] pis = ValidateMethodAndGetParameters(null, method);

            ValidateArgumentCount(method, ExpressionType.Call, 5, pis);

            arg0 = ValidateOneArgument(method, ExpressionType.Call, arg0, pis[0], nameof(method), nameof(arg0));
            arg1 = ValidateOneArgument(method, ExpressionType.Call, arg1, pis[1], nameof(method), nameof(arg1));
            arg2 = ValidateOneArgument(method, ExpressionType.Call, arg2, pis[2], nameof(method), nameof(arg2));
            arg3 = ValidateOneArgument(method, ExpressionType.Call, arg3, pis[3], nameof(method), nameof(arg3));
            arg4 = ValidateOneArgument(method, ExpressionType.Call, arg4, pis[4], nameof(method), nameof(arg4));

            return new MethodCallExpression5(method, arg0, arg1, arg2, arg3, arg4);
        }

        private static Func <int[], int[]> GenerateCopyExpression()
        {
            var ctor = typeof(int[]).GetConstructor(new[] { typeof(int) });
            var get  = typeof(int[]).GetMethod("Get", new[] { typeof(int) });
            var set  = typeof(int[]).GetMethod("Set", new[] { typeof(int), typeof(int) });

            var p1     = Exp.Parameter(typeof(int[]));
            var v1     = Exp.Variable(typeof(int[]));
            var v2     = Exp.Variable(typeof(int));
            var @break = Exp.Label();

            var block = Exp.Block(
                new[] { v1, v2 },
                Exp.Assign(v1, Exp.New(ctor, Exp.Property(p1, "Length"))),
                Exp.Assign(v2, Exp.Constant(0)),
                Exp.Loop(
                    Exp.IfThenElse(
                        Exp.LessThan(v2, Exp.Property(p1, "Length")),
                        Exp.Block(
                            Exp.Call(v1, set, v2, Exp.Call(p1, get, v2)),
                            Exp.AddAssign(v2, Exp.Constant(1))
                            ),
                        Exp.Break(@break)
                        ),
                    @break),
                v1
                );

            return(Exp.Lambda <Func <int[], int[]> >(block, new ParameterExpression[] { p1 }).Compile());
        }